@Darren: I did not plan to release the source code as it's quick, dirty and uncommented. But if you'd like to check it out. no problem :-)
@Barry: I made an eror during export of the stl. It's ment to be printed on the straight edge (so 90° flip). Like that the mount will not snap as fast.

@Darren: I used wp5.sh as reference and created a simple GUI to make internet sharing easier and faster. Currently its pretty hacky but it lists all available interfaces and allows manual change
Main View
Interface selection (ethernet, wifi or in that case usb tethering)
After hitting "Save" a little confirmation pop-up:

@Havenbreaker
1. The case was a cheaper replica of a Pelican Case 1450. Same dimensions, but much cheaper.
2. It's a 9'' LCD-Touch display that runs on 5[V] so there is no mix of different voltage levels. I made a simple GUI for internet sharing, so that it can be done via simple presses on the touchscreen :)
Desktop overlay information is displayed using conky

Ok, so I finished the first "minimal" design. It holds the Nano very well and is Printed out pretty fast ~45 minutes. Will keep working on a more "fancy" one as soon as I find the time.
Check out: http://www.thingiverse.com/thing:1244841
Here a few pics of the mount in action:

@Seb: Thank you for your kind words! Indeed I planned to add some cutouts in the final version. I guess I will add a bunch of changes, once I have my NANOs. Working on a version with a 15mm fan for active cooling
Gruss
Gadget

Finished the first version of the NANO mount. Will adjust all the dimensions, once I get my hands on my NANOs (hopefully tomorrow ).
What do you guys think about it?
Using double-sided adhesive tape mounted anywhere you want. Thread the NANOs USB-Plug through the hole and press it down, so that the RP-SMA antenna
is latched in.
Cheers
MrGadget

@Mr-Protocol: thx for the link!
@Darren: Would be great to have the CAD files for the final case (technical drawings would be good aswell) :-)
Looking to make a functional mount that could be printed fast while still providing air circulation to ensure proper function of the NANO.
If you don't have the files available, I just need to wait for the NANOs to arrive and the measure it by hand.
Cheers
MrGadget